public class Circle {
    private double radius; // 半径
    public Circle(double radius) {
	this.radius = radius;
	}

    public double getPerimeter() {
	return Math.round(2 * Math.PI * radius * 100) / 100.0;
	}
    public double getArea() {
	return Math.round(Math.PI * radius * radius * 100) / 100.0;
	}
}

